noun
admission gate; entrance gate
Refers to the gate or entrance through which one enters a venue, such as a stadium, concert hall, or exhibition.
コンサート会場の入場門は午後5時に開きます。
The admission gate for the concert venue opens at 5 p.m.
Compound of 入場 (にゅうじょう, 'admission') and 門 (もん, 'gate').